From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.mixaill.net (mail.mixaill.net [144.76.234.135]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2F1991A8401 for ; Fri, 14 Mar 2025 08:40:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=144.76.234.135 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741941638; cv=none; b=U6DHVpkkaRy3tE3LyS/2VMaYpm05coc6N1ndhBZjrZr6e9EYje+sTc9/DGohiektMkk10uH1SDZGJK6aMu+mrQq6LqvuSX1RzrU9EbCAUV9t2ouRq9xlLen0gMixvOq5A/tlP4oKf/KoHC9yGIpK3LZfZ2drtvI7+JMpjX+yL6w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741941638; c=relaxed/simple; bh=ymZJE5zAaKC5pDreT85G+3DnxIxN5wwiQ8dIrrWayP4=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=IMlNmMb8V/WX9mHxlr3yEN9AVHlsQzgFstv6RBvi6a3ndrkuROzI/ExEgUkzuQOuuDgBfhy+xuHzizU3TlRY4RClEzrZRx669t9NavfMx/N87OrMq/shR6jz3n57IOMlzWW/M4IWnl2e/GRWkrM3soi3cxfp7z3nrUiZMaID2AU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=mixaill.net; spf=pass smtp.mailfrom=mixaill.net; dkim=pass (2048-bit key) header.d=mixaill.net header.i=@mixaill.net header.b=b5GPxC5t; arc=none smtp.client-ip=144.76.234.135 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=mixaill.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mixaill.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mixaill.net header.i=@mixaill.net header.b="b5GPxC5t" Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id E60E46CB4E; Fri, 14 Mar 2025 08:40:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mixaill.net; s=dkim; t=1741941634; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:content-language:in-reply-to:references; bh=tt/+Z53CFv+48F7kyaZtu0b6hI11nI+nv/7Uk8SctiQ=; b=b5GPxC5t5dMGhUdveHCgwIr2WIC/IAlZXJzGh5YnKXo4lCPjfSQBMKCoKL/kkcDfCflz28 +Cvi1gRCoTCcoTft4HlKQQzVhpxx3BGSwslYNzvEJXVrLmXmMy8EQCl6l7Rfai1pCSRSDj liJ8iEBtVEPpMhW1eI/7Mo5RlZz75lpzaSmBclmrW30s7zp+A8HCaLbwZL2GXrU/Uv5/CO y0ut88SEqlogOJGSZ3ThCg/XCryi1ra86gUEUEeFH3o/whT/DVF6a5OktXJVdKP8OKIYyK Sl/dZRnLgRP5XeTAUImRFgx9CSirOaRmR01aiiJi/rPOgylyBkFZ/gHVo0IwtQ== Message-ID: Date: Fri, 14 Mar 2025 11:40:31 +0300 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/2] x86/rdrand: implement sanity check for RDSEED From: Mikhail Paulyshka To: Borislav Petkov Cc: Thomas Gleixner , Ingo Molnar , Dave Hansen , x86@kernel.org, linux-kernel@vger.kernel.org, Mario Limonciello References: <20250312123130.8290-1-me@mixaill.net> <20250312124006.GCZ9GApgQQ49dO_BMW@fat_crate.local> <10f010ca-b79f-4886-ba18-3013560905b2@mixaill.net> Content-Language: en-US In-Reply-To: <10f010ca-b79f-4886-ba18-3013560905b2@mixaill.net> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Last-TLS-Session-Version: TLSv1.3 On 3/12/25 4:17 PM, Mikhail Paulyshka wrote: > On 3/12/25 3:40 PM, Borislav Petkov wrote: >> On Wed, Mar 12, 2025 at 03:31:28PM +0300, Mikhail Paulyshka wrote: >>> On the AMD Cyan Skillfish (Family 0x17 Model 0x47 Stepping 0x0), which >>> is a Zen2-based APU found on the AMD BC-250 board, there is a situation >>> where RDRAND works fine, but RDSEED generates FF. This leads to some >>> applications that use RDSEED to generate random numbers (such as >>> Qt and KDE) into a nearly unusable state. >>> >>> Although AMD has fixed the Zen2 RDRAND issues in 2019 with a >>> microcode update, >>> no such update has been released for the Family 0x17 Model 0x47 core. >> What's the microcode level on that machine? >> dmesg | grep -i microcode [ 0.059689] [ T0] Zenbleed: please update >> your microcode for the most > optimal fix [ 0.663746] [ T1] microcode: Current revision: 0x08407007 >> Also, send >> >> cpuid -r > > https://paste.debian.net/1362645 > Link expired. Permanent link: https://mixaill.net/linux-kernel-lists/bc250_log_1.txt